Definition
A category of pilot deviation that occurs on the airport surface, including taxiing, taking off, or landing without proper clearance, failing to follow ATC taxi instructions, crossing a runway hold-short line without authorization, or otherwise not complying with movement-area rules.
Plain English
Mistakes a pilot makes while moving the aircraft on the ground at an airport — like turning down the wrong taxiway, crossing a runway without permission, or taking off before being cleared.
Context Anchor
Seen in discussions of pilot deviations, taxi instructions, runway crossings, and airport surface operations.
Derivation
‘Deviation’ comes from Latin deviare, meaning ‘to turn off the road.’ A ground deviation is literally turning off the cleared path while on the ground — going somewhere, or doing something, ATC did not authorize.
Why Pilots Care
Ground deviations can produce runway incursions and trigger FAA enforcement actions or certificate action.
Intuition Check
Do not read “ground deviations” as any small mistake made while on the ground. In this context, it means departing from a clearance, instruction, route, or required procedure during airport surface operations.
Example Sentence 1
The pilot was issued a ground deviation after crossing Runway 27 without holding short as instructed by the tower.
Example Sentence 2
Controllers file reports on ground deviations just as they do for airborne pilot deviations.